Relationship between tightness of the hip joint and elbow pain in adolescent baseball players - Saito, M; Kenmoku, T; Kameyama, K; Murata, R; Yusa, T; Ochiai, N; Kijima, T; Takahira, N; Fukushima, K; Ishige, N; Takaso, M (Orthop J Sports Med, 2014)